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利用Spring MVC 的 Interceptor 實現個簡易的性能監控，計算一下每個url的執行時間。
在 preHandle 方法中記錄當前的時間戳到線程局部變量里，然后在afterCompletion方法中，用當前的時間戳剪掉線程局部變量里的時間戳得出個運行時間，并記錄到log里。
這只是個簡易的性能監控，如果想長期正式的監控性能，請選擇其它成熟的產品。
Interceptor
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.core.NamedThreadLocal;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
public class PerformanceInterceptor implements HandlerInterceptor {
private final static Logger LOGGER = LoggerFactory.getLogger(PerformanceInterceptor.class);
private NamedThreadLocal<Long> startTimeThreadLocal = new NamedThreadLocal<Long>("performance");
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
throws Exception {
startTimeThreadLocal.set(System.currentTimeMillis());
return true;
}
@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
ModelAndView modelAndView) throws Exception {
return;
}
@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
throws Exception {
long currentTime = System.currentTimeMillis();
long executeTime = currentTime - startTimeThreadLocal.get();
LOGGER.info("uri：{} 執行了 {} 毫秒", request.getRequestURI(), executeTime);
}
}
這里的是NamedThreadLocal沒啥神器的，源碼如下：
package org.springframework.core;
import org.springframework.util.Assert;
public class NamedThreadLocal<T> extends ThreadLocal<T> {
private final String name;
public NamedThreadLocal(String name) {
Assert.hasText(name, "Name must not be empty");
this.name = name;
}
@Override
public String toString() {
return this.name;
}
}
定義完Interceptor，注冊即可。
import java.util.List;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.boot.web.filter.OrderedCharacterEncodingFilter;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.web.filter.CharacterEncodingFilter;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
import com.vnierlai.scm.webapp.interceptor.PerformanceInterceptor;
@Configuration
public class WebMvcConfigurer extends WebMvcConfigurerAdapter {
@Bean
@ConditionalOnMissingBean(CharacterEncodingFilter.class)
public CharacterEncodingFilter characterEncodingFilter() {
CharacterEncodingFilter filter = new OrderedCharacterEncodingFilter();
filter.setEncoding("UTF-8");
return filter;
}
@Override
public void addInterceptors(InterceptorRegistry registry) {
registry.addInterceptor(new PerformanceInterceptor()).addPathPatterns("/**");
super.addInterceptors(registry);
}
@Override
public void addResourceHandlers(ResourceHandlerRegistry registry) {
registry.addResourceHandler("/webjars/**").addResourceLocations("classpath:/META-INF/resources/webjars/");
// registry.addResourceHandler("/resources/**").addResourceLocations("/resources/");
}
}
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持億速云。
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